package com.tianji.learning.listener;

import com.tianji.api.dto.trade.OrderBasicDTO;
import com.tianji.common.constants.MqConstants;
import com.tianji.common.utils.CollUtils;
import com.tianji.learning.service.ILearningLessonService;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.core.ExchangeTypes;
import org.springframework.amqp.rabbit.annotation.Exchange;
import org.springframework.amqp.rabbit.annotation.Queue;
import org.springframework.amqp.rabbit.annotation.QueueBinding;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.stereotype.Component;


@Slf4j
@Component
@RequiredArgsConstructor
public class LessonChangeListener {

    private final ILearningLessonService lessonService;

    /**
     * 监听订单支付或课程报名的消息
     *
     * @param order 订单信息
     */
    @RabbitListener(bindings = @QueueBinding(
            value = @Queue(value = "learning.lesson.pay.queue", durable = "true"),
            exchange = @Exchange(name = MqConstants.Exchange.ORDER_EXCHANGE, type = ExchangeTypes.TOPIC),
            key = MqConstants.Key.ORDER_PAY_KEY
    ))
    public void listenLessonPay(OrderBasicDTO order) {

        //健壮性判断
        if (order == null || order.getUserId() == null || CollUtils.isEmpty(order.getCourseIds())) {
            //数据有误, 无需处理
            log.error("接收到Mq消息有误,订单数据为空");
            return;
        }

        //添加课程
        log.debug("监听到用户{}的订单{}, 需要添加课程{}到课表中", order.getUserId(), order.getOrderId(), order.getCourseIds());
        lessonService.addUserLessons(order.getUserId(), order.getCourseIds());
    }

    /**
     * 监听用户退款的消息,触发课表自动删除
     *
     * @param order 订单信息
     */
    @RabbitListener(bindings = @QueueBinding(
            value = @Queue(value = "learning.lesson.refund.queue"),
            exchange = @Exchange(value = MqConstants.Exchange.ORDER_EXCHANGE),
            key = MqConstants.Key.ORDER_REFUND_KEY))
    public void listenLessonRefund(OrderBasicDTO order) {
        log.info("监听到用户退款的消息: {}", order);

        //判断订单数据是否符合要求
        if (order.getUserId() == null || CollUtils.isEmpty(order.getCourseIds())) {
            // 数据有误，无需处理
            log.error("接收到MQ消息有误，订单数据为空:{}", order);
            return;
        }

        //删除learning_lesson表中课程数据
        for (Long courseId : order.getCourseIds()) {
            lessonService.deleteLesson(order.getUserId(), courseId);
        }

    }
}